NA4919-XL bearing: complete specifications & equivalents

Specification table

Source: catalog reference (HR1 2026-09-25) · extracted 2026-09-30

Parameters extracted from the official FAG Rolling Bearings catalogue (HR1 2026-09-25); FAG® is a trademark of Schaeffler Technologies AG & Co. KG, used here for identification only — mpnbase is not an authorized FAG/Schaeffler distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at schaeffler.com.

Cross references & equivalents

Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.

How the NA4919-XL model number is decoded

envelope 95×130×35 mm: 95 mm bore accepts a normal-tolerance machined shaft via the integral inner ring, with a thin 17.5 mm radial section packed with small-diameter needle rollers C is 131 kN and C0 260 kN at the 95 mm seat; the C/C0 ratio of 0.50 is characteristic of a needle bearing — high static rating relative to dynamic in a compact 130 mm outside diameter the fatigue load limit Cur is 45 kN, the limiting speed 4,200 r/min and the thermal reference speed 2,400 r/min; for small needle bearings the reference speed can exceed the kinematic limit, so the lower of the two governs the application dynamic capacity per millimetre of bore is 1.38 kN/mm and per millimetre of width 3.74 kN/mm — the reason 35 mm-wide needle bearings routinely replace much larger ball or roller positions mass is 1.371 kg (1371 g), just 0.30 g per mm² of projected 130×35 mm envelope, which keeps unbalanced forces low in fast-actuating linkages at 95 mm bore the 130 mm outside diameter and 35 mm width target rolling stands, construction machinery and heavy gearboxes; the limiting speed drops to 4,200 r/min The integral inner ring brings the bore to 95 mm inside the 130×35 mm envelope; removing that ring gives the corresponding RNA/NK execution and a larger shaft for the same housing Reading the NA49 prefix: machined-ring needle bearing with inner ring, one roller row, capable of pure radial load at 131 kN C -XL means this is an X-life bearing — Schaeffler's upgraded performance level with smoother raceways, so the 131 kN C rating and longer nominal life come without an envelope change. Typical applications include two-stroke and compressor piston pins, motorcycle and light-vehicle transmissions and rocker arms and valve trains, where the 130 mm outside diameter and 131 kN dynamic rating match the duty. In two-stroke and compressor piston pins the unit fits a compact 95 mm seat, and in motorcycle and light-vehicle transmissions the 1.371 kg mass is part of the rotor inertia calculation. Designers also specify it for rocker arms and valve trains, relying on the 35 mm width and the published 260 kN static rating. Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone. Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.

Typical equipment & failure modes

Selection pitfalls — read before you substitute

• Open ends draw contamination directly onto the needles; specify sealed or shielded positions in dusty environments rather than relying on grease alone.
• Needle bearings are pure-radial units — any thrust must be taken by separate washers or an adjacent bearing, especially on flangeless RNAO/NAO.
• Keep the specified radial clearance; an oversized shaft or heavy interference removes it and the needles bind hot immediately.